Port Knocking

Definitions

1. A technique that keeps a service hidden until a client sends a predefined sequence of connection attempts. It shows up in application security, identity, infrastructure, or incident response work depending on the environment. Teams use the concept to prevent abuse, detect adversary activity earlier, or define stronger control boundaries during engineering, testing, and operations.

   In plain English: Port Knocking is the practical security idea behind a control, weakness, or safeguard. It matters because it changes how attackers succeed or defenders reduce risk.

   Example: "During the review, the team focused on Port Knocking after telemetry and testing showed it was the fastest way to reduce exposure, tighten controls, and close a realistic attack path before the next production release."

Related Terms

• Firewall
• WAF
• Privilege Escalation
• Authorization
• Capability
• NAC
• Network Access Control
• IP Whitelisting